Reflexes, or reflex actions, are involuntary, almost instantaneous movements in response to a specific stimulus. Reflex arcs that contain only two neurons, a sensory and a motor neuron, are considered monosynaptic. Examples of monosynaptic reflex arcs in humans include the patellar reflex and the Achilles reflex.
A microwave oven uses microwaves. This is a kind of electromagnetic wave. The energy source for the microwave oven is AC (alternating current, electricity), available in many houses.
Microwave radiation is also used in electron spin resonance spectroscopy. For microwave ovens and some radar applications, the microwaves are produced by magnetrons. Of great astrophysical significance is the 3K background radiation in the universe, which is in the microwave region.